Trump had been expected to call for a so-called Section 301 investigation under the 1974 Trade Act earlier this month, but action had been postponed as the White House pressed for China’s cooperation in reining in North Korea’s nuclear program.

Politico said it was not clear how much detail Trump would provide in his announcement, but that administration officials expected U.S. Trade Representative Robert Lighthizer to open a section 301 probe. (Reporting by Tim Ahmann; Editing by Clarence Fernandez)